Tower Hill is the area surrounding the Tower of London in the London Borough of Tower Hamlets. It is infamous for the public execution of high status prisoners from the late 14th to the mid 18th century. The execution site on the higher ground north-west of the Tower of London moat is now occupied by Trinity Square Gardens.

Tower Hill rises from the north bank of the River Thames to reach a maximum height of 14.5 metres (48 ft) Ordnance Datum. The land was historically part of the Liberties of the Tower of London, an area the Tower authorities controlled to keep clear of any development which would reduce the defensibility of the Tower. Building has encroached to a degree, but a legacy of this control is that much of the hill is still open. The hill includes land on either side of the London Wall, a large remnant of which is visible.

Generally speaking, the name Tower Hill informally applies to those parts of the Tower Liberty that are outside the Tower of London and its moat. Great Tower Hill is the land lying inside (or west) of the line of the London Wall whereas Little Tower Hill is the land outside (or east) of the wall.

Public executions of high-profile traitors and criminals, often attainted peers, as well as innocent Catholics in the 16th century, were carried out on Tower Hill (some others were carried out within the confines of the Tower of London itself). The backgrounds to those carried out at Tower Hill ranged from the Peasants' Revolt of 1381 to the Wars of the Roses; Lollardism; claims to the throne by Perkin Warbeck and Lambert Simnel; the English Reformation; the Pilgrimage of Grace; the Monmouth Rebellion; the Jacobite Rising and the Gordon Riots of 1780. Lord Lovat's execution for high treason in 1747 was the last judicial beheading in England while the final executions on Tower Hill were hangings in 1780. Some 120 executions are chronicled and they include:-

After the abandonment of Tower Hill as a site for public executions, Trinity Square and Gardens were laid out in 1797 by Samuel Wyatt as the setting for Trinity House, completed a year earlier as headquarters of the Corporation of Trinity House.

In the 1880s, a section of the London Underground Circle Line was constructed beneath Trinity Square Gardens. In the first decade of the 20th century small buildings, courts and yards bordering Trinity Square were cleared to make way for the construction of the Port of London Authority headquarters at 10 Trinity Square. Begun in 1912 and completed in 1922, the Grade II* building is now a Four Seasons hotel which opened as such on 26 January 2017.

The Merchant Navy Memorial, First World War section, Grade I-listed, was unveiled by Queen Mary (deputising for her husband, King George V) on 12 December 1928. To avoid overshadowing this, the Grade II* Second World War section is in the form of a sunken garden and was unveiled by The Queen on 5 December 1955 while that commemorating merchant seamen killed in the 1982 Falklands War was unveiled on 4 September 2005 by the First Sea Lord, Admiral Sir Alan West.

In October 1933, Reverend P B ("Tubby") Clayton of All Hallows by the Tower and Dr B R Leftwich published "The Pageant of Tower Hill", which included the outline of a scheme to improve Tower Hill. In December 1933 the inaugural meeting of the Tower Hill Improvement Fund was held. Lord Wakefield was elected president and launched an appeal at the Guildhall in January 1934.